In mathematics, there are exactly the same amount of "even numbers" as there are "all whole numbers," even though even numbers are only half the set.

If you flip a fair coin 10 times and it lands on Heads every single time, the 11th flip is statistically "due" to be Tails.

The statement "This sentence is false" is a valid logical paradox because if it is true, it is false, and if it is false, it is true.

The repeating decimal 0.999... (where the 9s go on forever) is exactly equal to the integer 1.